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How is steam economy calculated?

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+2 votes
in Food Processing Unit Operations by (110k points)
How is steam economy calculated?

(a) Mass of evaporated liquid/Mass of heating steam

(b) Mass of evaporated liquid+Mass of heating steam

(c) Mass of evaporated liquidxMass of heating steam

(d) Mass of heating steam/Mass of evaporated liquid

This question was addressed to me during an interview.

My question is based upon Evaporation Equipment in section Evaporation of Food Processing Unit Operations

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Best answer
Right answer is (a) Mass of evaporated liquid/Mass of heating steam

To explain I would say: Steam economy is the number kilogram of water vaporized from all the effects per kilogram of steam used. For single effect evaporator, the steam economy is about <1. It is calculated as the ratio of mass of evaporated liquid to mass of heating steam.

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